Adjustable dumbbell



FIG. 1 is a front perspective view of a adjustable dumbbell showing my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof;

FIG. 8 is a rear perspective view thereof; and,

FIG. 9 is an enlarged view of the adjustable dumbbell taken from the circle part in FIG. 2 .

The evenly spaced broken lines in FIGS. 2 and 9 depict the boundaries of the enlargements that form no part of the claimed design.

The broken lines depict portions of the adjustable dumbbell that form no part of the claimed design. 

CLAIM The ornamental design for a adjustable dumbbell, as shown and described. 